Buying advice Petrol Limo 200+PS with reasonable consumption to pull hangers with 1,7t

Hello, I need some ideas for cars, which I should look at and are interesting for me. First of all the basic conditions: Budget +/- 15000 Euro driving performance around the 10-15k km mainly rural road year 2010+ would be my favorite 200 hp+ petrol trailer load of min 1.7t consumption should be appropriate. Named 15l/100km I would find happy, but 7l/100km I also don’t expect necessarily despite new technology The car should last a longer time. I put value on running culture u What came to my mind: Mercedes C250 – I dropped from 280, because the consumption can shoot up quickly, but Opel Insginia 2.0 turbo with 220 or the 250hp I find both models very chic. Does the Insignia really use so much? So 11 liters in normal driving would I consider the performance as normal. Do you have any fuel wonders that you could recommend? The maintenance should of course also be within the scope of this. . Since I have already read about good consumption values in the S class, but if then something gets broken then probably still expensive, because I have to go to the workshop. I myself have no idea of car trade. Thank you